2 needle sewing machine for angular seam

Abstract

To provide a twin needle sewing machine for corner sewing capable of sewing without generating a crossing thread on an upper face of a fabric. The fabric is turned at the time of pausing of sewing by using right and left needles and a looper. When the fabric is sewed again after turning, a corner sewing is applied to the fabric. The twin needle sewing machine for corner sewing has an air blower which blows air to thread loops in a needle rear part so that the thread loops are separated from a looper orbit, and a hook for sliding the thread loops caught by the looper toward a looper base side. When the fabric is turned clockwise, the thread loops in a rear part of the right needle are separated from the looper orbit in a range from several stitches before turning of the fabric to several stitches after turning of the fabric. When the fabric is turned counterclockwise, the hook is advanced by several stitches before turning of the fabric, and the thread loops of the left needle caught by the looper are slid toward the looper base side and the thread loops of the left needle are caught by the right needle. The thread loops of the rear part of the left needle are separated from the looper orbit by several stitches after the turning of the fabric.

Description

technical field [0001] The present invention relates to a 2-needle sewing machine for corner seams, in particular to a sewing machine for forming double-lock stitches for decoration on the inside of gray fabrics. Background technique [0002] In the prior art, as a 2-needle sewing machine for corner seams, the technology shown in Japanese Patent Application Laid-Open No. 63-186688 is known. This sewing machine has two left and right needles and a rapier (ル一パ). The two needles are respectively inserted through the needle thread and through the needle plate. The rapier advances and retreats from the right along the needle penetration point of the needle plate. In this sewing machine, the rapier catches the thread loop formed at the rear of the needle. The sewing operator, when the sewing by the left and right needles and the rapier stops once, rotates the gray cloth, and performs corner seaming on the gray cloth by sewing again after the cloth is rotated. In addition, this...

AI Technical Summary

Problems solved by technology

[0003] However, if a conventional 2-needle sewing machine for corner stitching is used to perform corner stitching while forming double-lock stitches, such as Figure 19 As shown, on the upper surface of the gray cloth W, the overlapping part of the first stitch S1 and the second stitch S2, that is, the lap line PT becomes very conspicuous, and the aesthetics of the sewn product is damaged.

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